Absolutely Trump, his administration and GOP politicians lie openly, because their purpose isn't to deceive, it's to demonstrate their power.
I'm sure I read that Bob Mueller is going to give testimony I think in the House shortly. He's gone on record to say Bill Barr lied, so I would hope that could be the tipping point. Doesn't have to mean impeaching Trump - Barr would be a good starting point.
I worry though that there are enough Americans who will watch testimony and regardless of what they hear and see, will stick to their beliefs . . . that Trump is akin to the Messiah and everyone who questions or challenges him is evil. And, there are others who just find it too much, are keeping their heads down and just don't want to know. They are probably the same folks who don't vote. The people who want the corruption and unraveling of the republic to stop will shout at their tvs and feel powerless if the structures aren't there to hold people accountable. I wish I had confidence that sooner or later, the bad guys will lose. I don't though. I mean look at the Brexit situ - every poll, local elections in England, businesses, etc. are all saying don't fucking do it, it's going to be shit on a stick, but you still have the Government, the opposition and state television (the BBC) insisting that it has to happen, regardless. I don't have much faith in a happy ending with that, either.